The Trunk, Gyroscopic action, more spinal engine

I am using the word Trunk more and more as I find the use of the word core over used and biased towards abdominal muscles. Many of the experts are focusing on anti-rotation and that is far from effective than focusing on quality gyroscopic action of the core. A great observation from Steve (hurdlesfirst.com) is the fact the lead arm in hurdling is always moving because it’s always working. The co